Missing Goldfish in a 65‑Gallon Tank: Koi Suspect or Escape Artist?

Scenario

Two goldfish + one koi (since 2004) in a 65‑gal tank. Smaller goldfish vanished. Owner suspects koi (“Hoggie”); husband disagrees.

Likely Explanations

• Jumped out – Common in uncovered tanks.
• Stuck in decor/filter – Check every crevice.
• Died and was eaten – Scavenging by tankmates.
• Koi predation – Unlikely unless goldfish was tiny; koi don’t typically hunt goldfish.

Urgent Issue: Koi in a 65‑Gal Tank

Koi need a pond (≥1,000 gal). “Hoggie” will outgrow the tank rapidly and degrade water quality.

Resource

Where did my fish go? checklist.